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Copy of CPO Electrical Power (6/7/2024)

Last updated over 1 year ago

20 questions

1 point

1

Question 1

1.

You use a 1200 watt hair dryer for 10 minutes each day. How many minutes do you use the hair dryer in a month. (30 day month)

30 minutes

300 minutes

15 minutes

40 minutes

1 point

1

Question 2

2.

How many hours do you use the hair dryer in a month?

5 hours

3 hours

30 hours

40 hours

1 point

1

Question 3

3.

What is the power of the hairdryer in kilowatts?

3 kW

1.2 kW

10 kW

1.8 kW

1 point

1

Question 4

4.

How many kilo-watt hours of electricitydoes the haidryer use in a month?

4 kWh

5 kWh

6 kWh

7 kWh

1 point

1

Question 5

5.

If your town charges $0.15 per kWh, what is the cost to use the hair dryer for a month?

$0.90

$0.80

$1. 10

$1.20

1 point

1

Question 6

6.

Your alarm clock is connected to a 120 volt circuit and draws 0.5 A of current.

30 w

40 w

50 w

60 w

1 point

1

Question 7

7.

Convert the power to kilowatts.

6 kW

0.06 kW

0.2 kW

10kW

1 point

1

Question 8

8.

Calculate the number of kilowatt hours of electricity used by the alarm clock if it is left on for a year. (365 days)

870 kWh

670 kWh

525.6 kWh

8 kWh

1 point

1

Question 9

9.

Calculate the cost of using the alarm clock for one year if your town charges $0.15 per kWh?

$78.84

$34.50

$12.90

$68.12

1 point

1

Question 10

10.

A toaster is plugged into a 120 volt household circuit. It draws 5 amps of current. What is the resistance of the toaster?

24 ohms

6 ohms

7.3 ohms

60 ohms

1 point

1

Question 11

11.

What is the power of the toaster in watts?

5 watts

24 watts

120 watts

600 w

1 point

1

Question 12

12.

What is the power in kilowatts

0.5 kW

0.6 kW

60 kW

12 kW

1 point

1

Question 13

13.

A circuit contains a 12 volt battery and two 3 ohm bulbs ind series. Calculate the total resistance of the circuit

6 ohms

8 ohms

3 ohms

1 ohms

1 point

1

Question 14

14.

Calculate the current in the circuit.

9 A

12 A

2 A

6 V

1 point

1

Question 15

15.

Calculate the power of each bulb.

12 watts

2 watts

20 watts

28 watts

1 point

1

Question 16

16.

Calculate the power supplied by the battery

2 watts

10 watts

12 watts

24 watts

1 point

1

Question 17

17.

A circuit contains a 12 volt battery 3 ohm bulbs in parallel. What is the voltage across each branch

3 v

6 v

12 v

24 v

1 point

1

Question 18

18.

Calculate the current in each branch.

12 A

14 A

4 A

2A

1 point

1

Question 19

19.

Calculate the powerof each bulb

4 watts

12 watts

24 watts

48 watts

1 point

1

Question 20

20.

Calculate the total curent in the circuit

12 A

8 A

6 A

24 A